Screw driver



May 6 1924, 7 493,165

E.A.' SCHADE SCREW DRIVER Filed 061:. 50. 1922 inventor Patented May 6, 1924.

PATENT OFF-ice.

EDMUND A. SCHADE, OF NEW BRITAIN, CONNECTICUT, ASSIGNCR TO THE STANLEY WORKS, OF NEW BRITAIN, CONNECTICUT, A CORPORATIONLOF CONNECTICUT.

SCREW- DRIVER.

Application filed October 30, 1922. Serial No. 597,744. 7

To all whom it may concern."

Be it known that I, EDMUND A. SOHADE, a citizen of the United States, and a resident of New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Screw Drivers, of which the following is a specification.

This invention relates to screw drivers and the like of the type having a shank extending through and anchored to the handle, and an integral screw driver blade on one end of the shank. The object of the invention is to provide a device of this sort of such improved construction that the onepiece blade and shank may be hardened to any desired length or throughout its entire length if preferred, so that it is enabled to withstand excessive strains to which it may be subjected when employing it as a screw driver or to any other .use to which tools of this kind are sometimes nus-applied, and then the handle is assembled on, and effectively anchored against turning to, the shank after the latter has been hardened and suitably finished or polished. A screw driver made in accordance with the present invention is relatively cheap in construction, is extremely strong and durable, and the parts may be readily and securely assembled.

In the accompanying drawing, wherein I have shown, for illustrative purposes, one embodiment which the present invention may take,

Fig. 1 is a side elevational view of my improved screw driver, the outer end of the. handle being in longitudinal central section to illustrate the manner in which the handle is secured to the shank Fig. 2 is a top plan view of the outer end of the tool showing the head or cap provided with four anchoring lugs embedded in the handle;

Fig. 3 is a view similar to Fig. 2 but showing the cap provided with two lugs; and

Fig. 4 is a view of the anchor cap or head in section screwed onto the outer end of the shank.

Referring to the drawing in detail, a designates the shank of the screw driver, on one end of which is fashioned an integral blade I). 0 denotes the wooden handle having a central opening or bore through which the upper end of the shank extends. The inner end of the handle is tapered and is embraced by a ferrule (Z which may be fixed to the handle and shank in any suitable" manner, as by means of a cross pin 6. h

designates the cap or head for securing the a handle tothe shank-against relative rotary and longitudinalmovement.

By preference, the shank a is formed" from round' steel stock of 'suitable diameter and length, one end being fashioned to form' I an integral blade b and th'eother e'nd'be ing provided with a screw thread 10, as indicated in Fig. 4. The wooden handle 0 has a central hole or opening 1 1 closely receiving the upper end of the shank, and this hole is counterbored at its upper end to provide a socket 12 for the cap h. The cap I]. has a threaded recess into which is adapted to be screwed the threaded end of the shank, as illustrated most clearly in Fig. 4. Provided at the upper end of the cap are a plurality of lugs or spurs 13 adapted to be embedded in the top of the handle. The cap may be provided with any desired number of these lugs, four being shown in Fig. 2, and two in Fig. 3, by way of illustration.

In the manufacture of screw drivers, constructed in accordance with the present invention, the shank, after its vouter end has been threaded and its inner end fashioned into a blade, and before the handle is assembled on the shank, is hardened and tempered to the desired length, preferably from end to end, and, in any event, to a point above the ferrule. The shank is then finished o-r polished to its marketable condition and forced into the opening of the handle until the threaded end extends slightly beyond the upper end of the latter. The

anchor cap is screwed onto the protruding end of the shank and then the shank and cap, by means of suitable tools, are securely fastened together being so by reason of the shank bottoming or abutting against the threaded socket of the anchor cap. The cap, assembled on the shank, and the handle are forced against each other causing the lugs to imbed themselves into the cap so that rotation between the cap and handle is prevented. It will be seen that the head immediately below the lugs 13 is provided with a circumferential groove 14; which is for the purpose of accommodating the fibres pressed out when the lugs are forced into the end of the handle, forming notches therein.- The cross pin e is then driven home to hold the parts together. Preferably, in the completed tool, the outer end of the handle is flush with the top surface or rounded end of the cap.

It will be noted that, with the construction described,'the handle and shank may be finished to marketable condition before they are assembled, and, more particularly, the shank may be hardened throughout its entire length so that it is suiiiciently strong to prevent bending when the screw driver is subjected to various uses besides that for which it is primarily intended as, for instance, when it is employed as apry bar.

" The construction facilitates ready assembly of the parts, and after the parts have once been assembled they fcannot become-loose.

As stated, the cap is screwed down onto the shank until the end of the latter abuts and is expandedagainst the bottom of the recess in the cap so that relative rotary movement between these parts is prevented. Rotary movement between the handle and cap is prevented, in part, by the interlocking lugs and recesses.

I claim as my invention I A screw driver having a shank provided with a blade at one end, ahandle having a central hole through which said shank eX- tends, the outer end of said hole being counterbored to provide a socket, and a cap secured to the outer end of said shank and positioned in said socket, said cap having lugs extending radially from the upper end i of said cap and having flat underfaces and axially parallel sides, said cap also having a circumferential groove below said lugs for accommodating the fibers pressed out by said lugs when driven into said handle.

EDMUND A. SCHADE. 

